Why is the radio 1 transmitting power with 0 dBm, even when the radio 1 is on and a channel is selected. (AP3825i-1)

We have a V2110 Medium running withSoftware: 10.41.10.0014, after a few hours a lot of 3825i-1 (30 out of 80) starting transmitting power with 0 dBm!. And the clients can't see the emitted SSID anymore. We use all channels on Radio 1 (5GHz) and the selection is auto. You have to turn Radio 1 off and on to get back the power. The country code is correct and the license is valid. That's all a little bit miserable. Any suggestion how to solve the problem? Green IT?

7 replies

Is there a neighbouring AP on the same 5GHz channel causing this one to ‘back off’ and drop power down? Anything in the controller or individual AP logs? Any logs mentioning RADAR being detected on the same 5GHz channel? Does your channel plan allow to move to non DFS if there is mention of RADAR? Personally I’d prefer to have the APs hard coded for both power and channels based on the initial physical site survey results.

The 5Ghz channels of the neighbours are all different, we check this with the floorplans in netsight, you can get a fast overview. Radar interference is not seen in this case. And it doesn't matter whether it's a non-DFS or a DFS channel. The APs doesn't log anything when they stop to "transmit" with 0 dBm. As far as you can see in the Identifi log of the APs.

We had a similar problem with a deployment of AP3825e's. The APs would freeze up and stop transmitting. The power would drop to zero and the SSID would disappear. A reboot would bring them back for awhile but then they would freeze up again.

GTAC recommended to remove Radio Management 11k support from the VNSs that were working on the APs.
We did this and the problem did not recur.

Here are my results from the last few days:
a) I factory reset an AP 3825i and synced it again
b) I changed the country code of another AP 3825i from Germany to Austria.

24 hours later the AP from a) and b) were still transmitting with more than 0 dBm.

Both solutions seem to work. So I had to facory reset about 26 APs, or take a another "Country Code".
I was not realy amused about both slolutions. Should I take cholera or black death?

I decided to have a look for a newer version and I found version 10.41.11.0009.
I installed the version on Saturday 11/17/2018 at 5pm.
And now 36 hours later still all APs are tranmitting power with more than 0 dBm.

Some background information: One week ago we made the version upgrade from 09.21.18.0009 to 10.31.10.0001 to 10.41.10.0014. Now with version 10.41.11.0009 everything seems to be fine.

Not clear what realy caused the problem, maybe the upgrade form 09.21 to 10.31. Now that's something for the experts.

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